As the others in the thread have said, there is a newer anti-cheat system that is being worked on. For now, you can record them with a screen recorder like Bandicam, OBS, or any various ones built in to your pc/laptop. Then, upload said video to youtube and make a report in https://www.cubecraft.net/forums/report-a-player.24/.

If this is not what you are meaning in your thread, then please feel free to try to explain in a different way to help us more understand.